<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<title>My web site</title>
		<style type="text/css">
			.box{
				width: 300px;
				height: 390px;
				background-color: #999;
				border-top: 3px solid aqua;
				border-bottom: 3px dotted azure;
				border-right: 3px dashed beige;
				border-left: 3px double greenyellow;
			}
		</style>
	</head>
	<body>
		 <div class="box">盒子边框</div>
	</body>
</html>